What difference would a new bridge make?

This may seem a stupid question, but what difference would fitting a new bridge make to tone, playability, etc? I play a MIA Fender Jazz with the stock bridge, string thru body, etc. I'm happy with the way it all sounds, but was wondering if a new bridge would further improve on the sound. It may not be necessary for me at all, but I was just wondering what difference it would make.

I did a search, and over a 1000 threads showed up, so forgive me if this has been covered before, feel free to point me in the right direction

Provided your bridge is really with a string-thru-body design, then you won't get a drastic change in sound, you'll only get a slight change, if at all.
It's more about the added flexibility in setting up action etc. when you install a 3D bridge.